The flywheel is based around a 2×12 of Douglas Fir I picked up at the big orange store. Not exactly high quality wood, but it gave me the mass I was looking for. I then added a layer of 3/4” pine boards to increase the mass a bit more.
I cut the flywheel by mounting it in a vise and using the bow saw I made to cut the rough shape. Doing it this way seemed to be a lot faster than cutting rounding by cutting corners.
Once the rough shape was cut, I then trued up the wheel with a spokeshave.
The flywheel has a 5/8” hole bored through the center. There are also 1 3/8” holes bored 1/2” deep on each side to accept two sets of bearings that the flywheel rides on.
Once the bearings are in, the flywheel is mounted on the support and locked into place with stop collars.
To get the wheel to turn freely, I had to sand down the 5/8” steel rod that the flywheel was mounted on. It was just a bit too large and was causing the mounting to drag on the flywheel, greatly reducing it’s speed. Once I got it slimmed down, the speed of the flywheel increased greatly. The shine of the right side gives away my work:
Finally, the wheel mounted:
-- Brian - Belmont, Massachusetts